Gerould. — Caudina. 
PLATE 1. 
Abbreviations. 
aq. crc. 
Circular water canal. 
mu. tv. 
Transverse muscles of the 
aq. r. 
Radial water canal. 
body-wall. 
cl. gn. 
Ganglionic cell. 
n. 
Nervous tissue. 
cp. sph. 
Spheruliferous wandering 
n. r. ex. 
External band of the radial 
cell. 
♦ 
nerve. 
eta. 
Cuticula. 
n. r. i. 
Internal band of the radial 
e’n. r. 
Radial epineural canal. 
nerve. 
en'th. 
Endothelium. 
pa. gen. 
Genital papilla. 
e'th. 
Epithelium. 
sep. 
Connective-tissue partition. 
h’pn. r. 
Hyponeural canal. 
sng. r. 
Radial haemal vessel. 
mad. 
Madreporic body. 
fbl. mu. 
Tubules composed of mus- 
cle fibers. 
Fig. 1. 
Fig. 2. 
M l or 
1 J fc>* 
3. 
Fig. 4. 
Fig. 5. 
Cross section through one of the radial nerves and accompanying 
vessels. X 360. 
Cross section through the body-wall near the region of the tentacles. 
X 330. 
Portion of circular water canal with stone canal and madreporic body. 
X 12. 
Oblique view of anterior extremity of the body. X 6. 
Cross section of the body-wall through a radius, showing muscle 
tubules. X 118. 
